Storage of helium

Note that storage of helium in the core remains only one component of a noble gas model that can describe the range of noble gas observations. The core has only been evaluated as a possible storage of He. The incorporation in the core of other noble gases, and their relative fractionations, cannot be clearly evaluated without more data. Also, the distribution of radiogenic nuclides such as "" Ar, Xe, and Xe that are produced within the mantle must be explained with a model that fully describes the mantle reservoirs. While these issues may be tractable, a comprehensive model that incorporates a core reservoir remains to be formulated. It should be emphasized that the core does not completely explain the distribution of helium isotopes, since the issue of the " He-heat imbalance is not addressed at all by this model. It appears that even if high He/ He ratios are the signature of involvement of core material in the source of mantle plumes, several mantle reservoirs are still required. 

Illustration 1.3 Underground Storage of Helium Diffusion through a Spherical Surface... 

As the no-loss transport and storage of helium leads to storage reservoir pressures and temperatures above critical, because of the extremely low latent heat of the liquid, a helium pump has to be capable of pumping helium at a va-... 

The essential features of the earlier commercial models were that the two piston engines were vertically arranged inside the large finned heat exchanger in a static atmosphere of helium with LHe from the Joule-Thomson expansion collecting in the bottom of the dewar. This liquid could be either used in situ or transferred to all external storage dewar. The energy of expansion was absorbed in a crosshead on top of the dewar assembly. 

As we said, the material of the regenerator of a PTR must have a high specific heat to provide a good heat storage. Unfortunately, below 20 K, the specific heat of most regenerators rapidly decreases, whereas the heat capacity of helium increases and has a maximum at 10K (see Fig. 5.20). 

Scans based on resonant ejection may either be carried out in a forward, i.e., from low to high mass, or a reverse manner. This allows for the selective storage of ions of a certain m/z value by elimination of ions below and above that m/z value from the trap. Thus, it can serve for precursor ion selection in tandem MS experminents. [156,158] Axial excitation can also be used to cause collision-induced dissociation (CID) of the ions as a result of numerous low-energy collisions with the helium buffer gas that is present in the trap in order to dampen the ion motion. [150,156] A substantial increase of the mass range is realized by reduction of both the RF frequency of the modulation voltage and the physical size of theQIT. [154,159,160]... 

The history of helium conservation measures dates hack to 1925 when the U.S. Congress passed ihe Helium Act of 1925. Congress amended the act in 19 >o to provide for stripping natural gas of its helinni. lor purchase ci 1 the separated helium by the government, and fur its long-ierm storage. In 1971, after about 28 billion cubic feel hud been stored i in a federally owned... 

Since helium gas is a precious resource, the contents of a small passenger balloon were pumped to storage during an overhaul. Normally the balloon contains 18,700 ft3 of helium at31°C and 1.00 atm (14.71b/in2 or 14.7 psi). How many... 

Marine, I.W. (1979) The use of naturally occurring helium to estimate groundwater velocities for studies of geologic storage of radioactive waste. Waste Resourc. Res. 15, 1130-1136. 

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